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TWIN PLATE CHECK VALVE Double Flanged, Retainerless
& Extended Face to Face
Installation, Operation & Maintenance Manual
www.abacusvalves.com PART OF THE
GLEN FOUNDRY GROUP
Rev 1
INTRODUCTION This generic manual is written for operating, maintenance and supervisory personnel. The manual must be read, understood and observed by operating personnel. Scope of valves covered -: 4X4 range.
COPYRIGHT The copyright for this manual remains with Abacus Valves International Ltd. The instructions, images and drawings contained herein may not be reproduced either in full or in part, nor used for competitive purposes or communicated to other parties without authorization from Abacus Valves International Ltd.
HEALTH AND SAFETY AT WORK Please ensure that all relevant Health and Safety issues and regulations are strictly adhered to, prior to and during any installation work carried out on these Abacus Twin Plate Check Valves. It is essential that whenever work is being undertaken on a valve that may involve the release of internal pressure, that the valve is fully depressurised prior to any such like work, with the line drained and isolated safely. It is essential that when handling the valve assembly that the user is aware of the mass of the components. It is the users responsibility to ensure that safe working practices are followed at all times. This manual had been designed to assist and act as a guideline for users but is not a replacement for adequately trained, competent staff. It is the responsibility of the end user to ensure that only qualified staff undertake relevant duties. Abacus Valves International Ltd cannot be held responsible for any accidents arising from incorrect installation, operation or maintenance. The responsibility must rest wholly with the end user. IMPORTANT NOTE: IF IN DOUBT ABOUT ANY OF THE FOLLOWING CONTENT, CONTACT ABACUS VALVES INTERNATIONAL LTD AND REQUEST THE TECHNICAL DEPARTMENT.
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TYPICAL CONSTRUCTION
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Item No. Description Qty 1 Body 1 2 Pin Carrier 2 3 Pin 2 4 Plate 2 5 Bearing - 6 Torsion Spring 1 7 Flange Insert 1
OPERATION OVERVIEW
The Abacus Twin Plate Check Valve provides an energy efficient solution to backflow problems in piping systems. The Abacus Twin Plate Check Valve works on the following principle:
• Two sprung loaded, semi-circular disc’s hinged on a vertical pin. • The torsion spring contact legs are designed such that the resultant spring force
acts beyond the centroid of the disc’s. The disc are designed for a clearance fit between the hinge bores and the vertical hinge pin.
• When the upstream (inlet) fluid force is greater than the spring force, the disc will move off the seat, heal first as the resultant force acts at the disc centroid position and flow is induced.
• as flow rate increases the disc rotates towards a fully open position where it stops against the top pin.
• When the flow starts to decelerate, the disc’s react immediately, with the aid of the spring, to move back towards the seat.
• The disc’s will fully close against the seat just before backflow starts, forming a non-slam, tight shut-off.
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VALVE FULLY OPEN VALVE OPENING VALVE CLOSED
DIRECTION OF FLOW
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STORAGE / HANDLING • Valves should be stored in a clean and dry environment and within the temperature
limitations of the valve. Protection is recommended. • They should not be crushed or used to support other items. • When handling the valves, the preferred method is to lift the valve using the lifting
points provided. INSTALLATION • Ensure that the valve is clean & free from any packing material or preservative and
that it is working correctly. • Check Valves can be installed in any plane, noting flow arrow, by centering the
valve between parallel flanges & gaskets, inserting bolts or studs and tightening nuts evenly to the correct torque. Valve must be fully supported across its end faces.
• Check valves should ideally be placed at a minimum distance of ten times the diameter of the pipe downstream from pumps or features in the pipeline liable to induce turbulence. Failure to observe this recommendation could adversely affect valve performance and service lifetime.
MAINTENANCE
Remove valve from pipeline by loosening all flange nuts and removing sufficient bolts or studs to allow the valve to be withdrawn from between the flanges. Clean valve to remove any aggressive materials. Position the valve on a safe, stable surface, in the vertical position, with the outlet facing upwards. Dismantle the valve: • Unscrew the flange insert component using a suitable tool
.
• Vertically lift out the plates sub assembly:
• Slide out pins to disassemble the plates sub assembly:
• Replace any worn or damaged items such as spring or bearings. • Lap in metal seat if applicable. • Clean threads carefully and remove all contamination. • Re-Assemble the valve by carrying out the opposite of the above.(Use suitable
thread sealant on threads). • Function test the valve ensuring free movement of plates. • Finally replace the valve in the pipeline.
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The Glen Foundry Group Contacts: Abacus Valves International Ltd Block 4 Riverside Road Paddockholm Industrial Estate Kilbirnie KA25 7EW T. +44 (0) 1505 681 777 F. +44 (0) 1505 683 999 E. [email protected] (Sales) [email protected] (Quality Department) [email protected] (Expediting) W. www.abacusvalves.com
Anderson Stewart Castings Plc Block 1, Units 1 & 2 Lochshore East Industrial Estate Glengarnock KA14 3DB T. +44 (0) 1505 683 368 F. +44 (0) 1505 683 771 E. [email protected] W. www.andersonstewartcastings.co.uk
Precision Tooling Services Ltd Building 11a Spirit AeroSystems Europe Ltd Prestwick International Airport Prestwick KA9 2RW T. +44 (0) 1292 678 479 F. +44 (0) 1292 678 650 E. [email protected] W. www.precision-tooling.co.uk
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